Privacy lock



March 20, 1956 E w NORTH ET AL 2,738,665

PRIVACY Lock Filed Aug. '7, 1952 5 Sheets-Sheet l March 20, 1956 w, NQRTH AL 2,738,665

PRIVACY LOCK March 20, 1956 w, RT ET AL 2,738,665

PRIVACY LOCK 5 Sheets-Sheet 5 Filed Aug. .7. 1952 March 20, 1956 E. w. NORTH ET AL PRIVACY LOCK Filed Aug. 7, 1952 5 Sheets-Sheet 4 March 20, 1956 E. w. NORTH ET AL 2,738,665

PRIVACY LOCK Filed Aug. 7, 1952 5 Sheets-Sheet 5 PRIVACY LOCK Edwin W. North, Rockford, Ill., and William B. Wilson, La Habra, Calif., assignors to National Lock Company, Rockford, 11]., a corporation of Delaware 2 Application August 7, 1952, Serial No. 303,092

Claims. c1. 70-446) The present invention relates to a lock construction of.

the type adapted for use in a bedroom, bathroom or other room where privacy is desired.

Among the objects of the present invention is theprovision of a novel lock or latch assembly embodying a pair of tubular cam members and a center tube adapted to be concentrically arranged within the cam tubes and connecting their cam ends, said center tube providing a reinforcement for the cam tube assembly as well as a housing for carrying the push button stem, locking lever and associated parts for latching and unlatching the lock or latch assembly by the occupant of a bathroom, bedroom or other room or enclosure where privacy is desired.

The present invention further comprehends the provision of a passage door lock or latch assembly employing a pair of cam members each connected to a knob at the opposite sides of the door whereby turning of a knob and its cam member causes retraction of a latch bolt, and

means operable by an occupant of a room desiring privacy for locking the latch bolt against retraction and opening.

of the door except from the interior of the room, said means including a tubular insert and locking mechanisnr carried by and operable within the insert and cam mem-- bers for assuring the occupant utmost privacy.

Another important object of the present invention is the provision of a novel type of privacy lock for bathrooms, bedrooms or other rooms or enclosures wherever an occupant desires to enter and secure privacyor undisturbed rest, the occupant securing such privacy upon entering such room or enclosure and when he closes the door anddepresses a button on the inner knob is assured against.

normal opening of the door and entry of anyone from the exterior until the occupant turns the inner knob whichautomatically releases the locking means and withdrawal of the latch to open the door.

A further object of the present invention is the provision of a novel locking means andmechanism for a permits privacy lock of the type adapted for use in bathrooms, bedrooms and the like, whereby the occupant of the room by pressing a push button on the inner knob locks the door against normal opening from the exterior.

In the drawings:

Figure l is a view in perspective of the novel lock conj struction and showing the manner in which it is mounted knob and showing the opening for permitting the inser-,

tion therein of a tool or relatively pointed instrument to tached to the outer end of a cam tube 11, the latter being" release the lock or latch and allow access to the locked room in the event of an emergency.

Fig. 5 is an enlarged view in horizontal cross section taken longitudinally. through the lock construction and door or closure in which it is mounted.

Fig. 6 is a view in vertical cross section taken on the line 6-6 of Fig. 5.

Fig. 7 is a view in horizontal cross section taken in a plane represented by the line 7-7 of Fig. 8.

Fig. 8 is a view in vertical cross section taken in a plane represented by the line 8-8 of Fig. 7.

Fi 9 is a fragmentary enlarged view, part in horizontal cross section and part in plan, the cross section being taken longitudinally through the cam tube assembly and showing the push button depressed to lock the parts against opening of the door from the exterior.

Fig. 10 is a fragmentary view, part in plan and part in horizontal cross section, of the assembly of Fig. 9, theview showing in top plan the push button, its stem and the locking lever in locked position, but showing the manner of releasing the locking lever when an emergency arises.

Figs. 11 and 12 are fragmentary views in side elevation of the inner end of the lock assembly and showing the ,push or actuating button, the stem of the button and the latching bar for latching the door from the inside of the bathroom or bedroom, Fig. 11 showing the latch bar in latching or locking position and Fig. 12 showing this bar partially released.

Fig. 13 is a perspective view of the lower.

Fig. 14 is an exploded or disassembled view of the center tube, the push button stem, the stem pin for the push button and the latching bar.

Fig. 15 is an exploded or disassembled view of the outer and inner cam tubes.

Fig. 16 is a view in perspective of the locking lever. Fig. 17 is a view in perspective of the center housing. Referring more particularly to the disclosure in the drawings and'to the novel illustrative embodiment therein shown, the present lock or latch construction is adapted for use with a door or closure for bathrooms, bedrooms and the like, where the door may be locked from the interior by an occupant and freely opened from the interior by such occupant upon turning the knob to leave.

But such door, when locked from the interior by the occupant, is normally prevented from being opened from the exterior. In other words, after an occupant enters the room, he gains privacy against normal entry by depressing the push button which locks the outer knob against rotation until such time as the occupant rotates the inner knob and thereby automatically releases the outer knob for free rotation.

As shown more clearly in the drawings and especially in Fig. 5, the outer knob 10 is clinched or securely atlongitudinally slotted at 12 and provided with a recess or opening 13, the slot 12 being adapted to slidably receive therein a detent or embossment 14 and the recess or opening 13 being adapted to receive a projection or tongue 15 bent inwardly from the cylindrical end 16 of the knob 10 tube '11.

The inner knob 17 is detachably mounted upon a cam tube 18 which is also longitudinally slotted at 19 for slidto thereby secure the knob 10 to its cam ably and detachably receiving a detent or embossment 21 on the cylindrical end 22 of the knob 17. But unlike the connection between the knob 10 and its cam tube on one end of a snap spring 24 which spring-biases the Patented Mar. 20, 1956 push plate or fol- 3 button or projection to its anchoring position in an opening 20. The spring 24 is secured at one end in the interior of the cam tube 18 by a rivet 25 whereby the free end of this leaf spring carrying the button or projection 23 may be depressed by any pointed instrument and when so depressed the knob 17 may be retracted and Withdrawn from its cam tube 18.

The cam tube 11 is cut away or slotted at its inner end," i. e. its end remote from the end upon which the knob is mounted, to provide an arcuate camming projection 26 (Figs. 5, 8 and with its longitudinal edges pro viding cam edges or surfaces 27 while the cam tube 18 is also cut away or slotted at its inner end to provide an arcuate cam projection 28, with this arcuate cammingend or projection 28 enlarged or expanded to overlap the camming end or projection 26 of the cam tube 11 as more clearly disclosed in Figs. 5 and 8, and thereat provided with cam edges 29. As there shown these overlapping camming surfaces are concentrically arranged.

The cam tube 11 is further provided with an elevated projection 30 adjacent its cam end and opposed indentations or stops 31, and the camming end 28 of the cam tube 18 is slotted and formed to provide an outwardly projecting tongue 32 and spaced indentations or stops 33 disposed at the opposite sides of the free end of the leaf spring 24 which is contoured to conform with the interior surface of the cam tube 18, to lock and prevent this spring from being moved laterally from its normal operative position, and a slot 34 for the reception of the enlarged latching end 35 of a spring-biased latching bar 36 for looking a push button stem 37 slidably mounted within the cam tube 18, in its depressed or locking position.

This push button stem 37 is preferably cylindrical in form and at its outer end carries a push button 38 suitably anchored or staked thereto by a tongue 39. Adjacent the staked end of the push button the stem is slotted at diametrically spaced points 40 and 49* to receive and retain the latch bar 36, the projection or movement of the enlarged end 35 being limited by the wings or ears 35 (Figs. 5, 6 and 14).

At its inner end (Fig. 14) this stem 37 is enlarged or expanded at 41 and conformably received in the inner end of a center tube 42 inserted into the adjoining ends of the cam tubes 11 and 18 and reinforcing the assembly and housing parts of the locking mechanism. This center tube 42 comprises a continuous tubular member having its forward or outer end 4-3 notched and provided with inturned opposed flanges 44 adapted to seat against the stops 31 of the cam tube 11 when these parts are in as sembled relation. At such time the other end 45 of the center tube seats against the stops 33 in the cam tube 18.

The center tube 4-2 is provided with a narrow, elongated slot 46 to receive a pin 47 carried by the push button stem 37 and further cut away or slotted to provide an arcuate substantially centrally disposed connecting portion 48 disposed in concentric relation and alignment with the overlapping, arcuate cam ends 26 and 28 on the cam tubes 11 and 18, respectively, and these contiguous and concentrically disposed arcuate cam ends 26 and 28 and the central portion 48 of the center tube 42 are encompassed or partially enclosed within a central housing 49 (Figs. 5, 7, 8 and 17) fitting conformably in a transverse bore in a door or closure 50.

This housing 49 is closed at one end 51, and this end extended to provide a reduced hub 52 providing a bearing for rotatably receiving the inner end of the cam tube 11 and externally threaded for the reception of a threaded hub of a clamping plate 53. The opposite face of the housing is provided with a separate cover or closure 54 held in fixed position by the outwardly projecting crimped or undulated tongues or flanges 55 projecting from the housing (Figs. 2, 3, 5 and 17). This cover is provided with an outwardly projecting hub portion 56 encompassing and providing a bearing for rotatably receiving the cam tube 18. Encompassing the hub 56 is a removable clamping plate 57 (Fig. 5) with the clamping plates 53 and 57 being adapted to abut and clamp therebetween the door or closure 50.

The clamping plate 53 after being threaded onto the hub 52 at the outer end of the housing 50, is held in its set or adjusted position against the outer face of the door rail by a screw or the like 58 threaded into the end plate with the end of the screw entering an opening or slot 59 in the clamping plate. Thus the clamping plate is held against rotation and prevented from backing off the threaded hub 52. An escutcheon 61 then covers this clamping plate 53 and the latter may be held in fixed position by turning inwardly the peripheral flange 62 over the outer edge 63 of the clamping plate 53.

The clamping plate 57 is preferably removably mounted onto the cover plate 54 which forms a closure for the open end of the housing 49. For this purpose the cover plate 54 is provided with projecting machine screws 64 with the head and adjacent portion of the shank of each screw adapted to be received in oppositely disposed keyhole slots 65 (Fig. 7) in the clamping plate 57. Thus when this clamping plate is mounted over the heads of these screws 64 and the clamping plate 57 is rotated so that the shanks of these screws are disposed in the narrow ends of the slots 65 and the screws tightened, the clamping plates 53 and 57 are held in clamped, abutting position with the door 50 (Fig. 5). An escutcheon 66 is then applied and detachably held in assembled position by oppositely disposed snaps or detents 67.

To lock the outer knob 10 and its tubular cam member 11 against rotation when the push button 38 and its stem 37 have been depressed by an occupant of the room or enclosure desiring privacy, the inner end of the stem 37 is longitudinally slotted at 37 and 37* (Figs. 5 and 14) to receive a locking lever 68 (Figs. 5, 9, l0 and 16), the inner reduced end of the lever projecting into the interior of the stem 37 with an edge 68 thereof projecting into the slot 37 of the stem 37 (Figs. 5 and 10), and a lateral projection 69 projecting into the slot 37 and the longitudinally extending slot 42 of the center tube 42 aligned therewith (Fig. 14). The locking lever extends longitudinally through the center tube and is notched with the projection 69 and a spaced, elongated projection 70 defining this notch. This projection 70 extends into the adjacent end of the slot 42 of the center tube 42 and the slot 12 of the cam tube 11 (Figs. 5 and 9), and when moved longitudinally to the left as viewed in Fig. 5 is adapted to enter a slot or notch 51 in the end plate 51 of the stationary housing 49 and thereby lock the outer cam tube 11 and its knob 10 against rotation when the push button 38 audits stem with the latching bar 36 have been depressed.

A coil spring 71 spring-biases the locking lever to the right to unlatched position as viewed in Figs. 5 and 7, one

end of the coil spring seating against the flanges 44 at the outer end of the center tube 42 and the other end seating or bearing against the projection 70 of the locking lever 68. However, so long as the push button 38 is depressed and the knob 17 is not manually turned, the latching end 35 of the latching bar 36 remains in the slot 34 of the tubular cam tube 18. But when the knob 17 is turned, the tapered end 35 of this latching bar 36 is depressed by a camming action of this tapered end 35 against the edge of the slot 34 (Fig. 6) to release the push button opening A at its forward or outer portion (Figs. 3, 8 and 17) and thereat formed with a pair of inturned flanges 572 each provided with an inturned lip 72 at one end,

and spaced, inturned tongues or projections 72 stamped from the body of the housing 49 (Figs. 8 and 17).

Mounted within the housing 49 adjacent the opening A is a follower or push plate 73 (Figs. 3, 5, 7, 8 and 13) of 1 substantially channel shape and with the end 74 adjacent 75 to spring-bias the follower or push plate 73 to its normal-or inoperative position as shown in Fig. 8, thus controlling its position within the housing.

. As shown more clearly in Fig. 8, the edges or cam surfaces 27 and 29 of the camming ends or projections 26 and 28 of the cam tubes 11 and 18, respectively, are adapted to engage or abut the adjacent surfaces on the channel portions, 75 and 76 of the follower or push plate 73 so thatwhen either the cam tube 11 or the cam tube 18 are rotated byturning of its respective knob, either of the arcuate edges or cam surfaces 27 or 29 engages and causes rotation'of the follower or push plate 73 in the direction of turning ettorts The ifollower or push plate 73 is disposed adjacent to orincontact with the outer end of a pusher or slide member 81 slidably mounted in the reducedneck 82 of a bolt housing 83. 'This pusher or slide member is adapted to be depressed or forced'inwardly into the neck 82 of the bolt housing 83 by rocking movement of the follower or push'plate whereby to apply a thrust to force this pusher or slidemember forwardly or inwardly, and through suitableconnecting mechanism cause retraction of a latch bolt'84. "As shown more clearly in Figs. and 8 of the drawings, the pusher or slide member 81 is of channel shape and provided'with a longitudinally extending slot 85in the base or connecting Wall 86 thereof, aligned longitudinally extending slots 87 in the opposite walls 88 thereof, and at its inner end it is provided with a seat or ledge 89(Fig. 5).

i. Mounted within the pusher or slide member 81 upon across pin 91 having its ends'passing through the elongated-slots 87 in the slide member and anchored in the oppositesides of the neck 82 of the bolt housing 83, is a bolt can or rocker arm 92 provided with a shoe 93 or projection at one end extending into the slot 85 and its other end 94 seating against a flange or projection 95 on the'inn'er'end of a bolt bracket 96.

The outer or forward end 97 of the bolt bracket may be staked and'coined or otherwise afiixed to the latch bolt 84; A compression spring 98 seating at one end against theseatror ledge 89 on the pusher 'or slide member 81 andat its other end against the rear of the latch bolt 84, spring-biases the latch bolt to its outer tion (Fig. 5).

1 The latch bolt housing 83 is provided with a face plate 99and a back plate 101 rigidly aflixed thereto, with these plates provided withscrew holes 102 for the reception of screws or the like for anchoring the latch bolt assembly inthe door 50. A strike plate 103 mounted in the edge of the door frame is adapted to receive the latch bolt '84 when the door is closed.

' Although the occupant is normally assured of privacy within the enclosure when the push button 38 is -depressed, the present invention comprehends means for unlatching the door in the case of an emergency when access must be had to rescue a child or other person who might be locked in and incapable of turning the knob to release the latch. This unlatching from the exterior may be accomplished by inserting a pointed instrument 104 (Fig. into an opening 105 in the outer knob 10 and,

applying sufficient'pressure against a closurecap 106 slidably mounted in the cam tube 11 and spring-biased to its forward or extended position by a coil spring 107, to cause this cap to engage the extended end or projection 108 on theouter end of the locking lever 68 and forcibly disengage or move the projection 70 of the lever from its ex-. tended, locked, position in the slot 51*. ;By tapering the enl 35 9f the latching bar 36, the application of sutlior latching posicient pressure thereagainst will release this bar from its.

interlocking engagement with the cam tube '18.

In the assembly of the lock construction in the door 50,. the knob 10 and the escutcheon 66 and its clamping plate 53, the outer and inner cam tubes 11 and 18, the center tube 42, the push button stem 37, the push button 38 and the latching bar 36, the housing 49, the push plate or follower 73 and the locking lever 68 with its springs and emergency release mechanism all combine to form a preassembled cam and center tube unit assembly. This bled in Fig. 1, the end of this cam and center tube assembly (Fig. 3) is readily inserted into atransverse bore 109 in the door 50.

When the above mentioned unit is partially inserted, the latching unit or assembly which includes the latch bolt 84, the latch bolt'housing 83, the pusher 81, the latch face plate 99 and asociated parts, which are also preassembled as a unit (Fig. 3), is inserted into the bore 111 communicating. with and extending at a right angle to the bore 109 and opening outwardly from the edge of the door. When the latch bolt assembly is pressed into its proper position in the door, its pusher or slide member 81 enters the: opening A in the housing 49 (Fig. 2) but to the right of the inturned lip 72 on this housing. In this position these inturned lips are aligned with the oppositely opening slots 112 in the inner reduced end 82 of the latch bolt housing 83, whereupon further inward movement of the cam and center tube assembly to its proper position in the door will cause the lips 72 on'the tive relation and ready for use.

In this assembled position, the inner end of the pusher or slide member 81 is disposed adjacent to or in abutting relation with the'face of the push plate or follower 73.

Afterthese separate assemblies or units are so positioned, the clamping plate 57 is affixed to the housing 49, the

escutcheon 66 is affixed to the clampingplate and the knob 17 is assembled on the cam tube 18 in the manner shown in Figs. 1, 5, 7 and 8. In this assembled relation the clamp plates 53 and 57 are clamped firmly against the sides-of the door 50 and the face plate is then secured by screws to the edge of the door;

In this novel construction of lock or latch assembly, the construction and arrangement of the split cam tubes 11 and 18 having their cam'ends in overlapping relation and the center or inner tube 42 which forms a novel and most eifective inner reinforcement for the encompassing parts are standardized and capable of use in various types of privacy locks. By making these parts standard and the inner tube capable of receiving and operatively com bining with the internal locking mechanism of the desired type, such standardization permits the interchange of parts, greatly reduces the cost of production and assembly of the so-called builders locks. to supply a complete line of such locks with interchangeable parts, so that in addition to reducing the cost of manufacture it reduces the cost of replacement and the substitution of different forms of lock Having thus disclosed the invention, we claim: 7 1. In a lock construction, a pre-assembled cam tube assembly and a pre-assembled latch bolt assembly adapted to be combined when assembled in openings provided in a dooror other closure, said cam tube assembly including a casing fitting conformably in a transverse opening in the door, a pair of split tubular members each journalled in an end wall of the casing, a reinforcing tube in said It permits a manufacturer tubular members, projections on said tubular members for locating and maintaining said tube against longitudinal movement, camming means on the adjoining ends of said members for retracting the latch bolt, said reinforcing tube being slotted intermediate its length and in alignment with said camming means, a floating push plate located in an opening in said housing and in the slot of said reinforcing tube adapted to be rocked by rotation of either camming means, and means in the latch bolt assembly actuated by rocking movement of the push plate for retracting the latch bolt.

2. In a lock construction, a housing adapted to be mounted in a transverse opening of a door or other closure, a pair of aligned split tubular members having their inner, adjoining ends projecting into the housing, a knob mounted on the outer end of each member, a reinforcing inner sleeve conformably received and anchored in said members, said adjoining ends of said members overlapping and being cut away to provide arcuate projections with their longitudinal sides providing camming edges, said sleeve being notched intermediate its length and adjacent said arcuatc projections, a follower in an opening in said housing and in the notch of the sleeve aligned with said opening adapted to be rocked by the cumming edges of either of said members as said member is rotated by turning of its knob, and a latch bolt adapted to be retracted by rocking of said follower.

3. In a lock construction, a housing adapted to be mounted in a transverse opening of a door or other closure, a pair of aligned split tubular members providing an outer and an inner cam member and having their inner, adjoining ends projecting into the housing, a knob mounted on the split outer end of each member, a reinforcing inner sleeve conformably received and anchored in said members, said adjoining ends of said members overlapping and the adjacent portion of the inner sleeve being notched and the ends of said members providing longitudinally extending arcuate projections with their longitudinal edges forming camming surfaces, a follower located in an opening in said housing and in the notch of the inner sleeve aligned with said opening, said follower being disposed adjacent and adapted to be rocked by the cumming surfaces of either of said members as said memher is rotated by turning of its knob, and a latch bolt adapted to be retracted by rocking of said follower.

4. In a lock construction, a housing adapted to be mounted in a transverse opening of a door or other closure, a pair of aligned split tubular members journalled in the end walls of the housing and having their inner,

adjoining ends projecting into the housing, a knob mounted on the split outer end of each member, a reinforcing inner sleeve mounted within said members and anchored against longitudinal movement therein, said adjoining ends being cut away to provide arcuate projections with their longitudinal sides providing camming edges, and said sleeve being slotted intermediate its length and adjacent said arcuate projections, a floating follower in said housing disposed in an opening in the housing and in the aligned slot of the sleeve and adjacent the arcuate camming projections whereby said follower is rocked by contact of the camming edges of either of said members as said member is rotated by turning of its knob, and a latch bolt adapted to be retracted by rocking of said follower.

5. In a lock construction, a housing adapted to be mounted in a transverse opening of a door or other closure, a pair of aligned split tubular members providing an outer and an inner cam member and having their inner, adjoining ends projecting into the housing, a knob mounted on the split outer end of each member, a contiuuous reinforcing inner sleeve mounted and anchored against longitudinal movement within said members, said adjoining ends and the adjacent portion of the inner sleeve being notched and the ends of said members providinglongitudinally extending arcuate projections with their longitudinal edges forming camming surfaces, a follower loosely arranged in an opening in said housing and dis and associated with the inner knob for locking the outer knob and its cam member against rotation and thereby preventing retraction of the latch bolt from the exterior of the closure.

6. In a lock construction, a housing adapted to be mounted in a transverse opening of a door or other closure, a pair of aligned split tubular members providing an outer and an inner cam member and having their inner, adjoining ends projecting into the housing, a knob mounted on the split outer end of each member, a slotted reinforcing inner sleeve conformably received within and anchored against longitudinal movement in said members, said adjoining ends and the adjacent portion of the inner sleeve being notched and the ends of said members providing longitudinally extending arcuate projections with their longitudinal edges forming camming surfaces, a floating follower in an opening in said housing and disposed in the notch of said inner sleeve adjacent and adapted to be rocked by the camming surfaces of either of said members as said member is rotated by turning of its knob, a latch bolt adapted to be retracted by rocking of said follower, a locking lever slidably carried in the inner sleeve and provided with a projection movable longitudinally in a slot of said inner sleeve, and means associated with the inner knob for locking said locking lever and the outer cam member against rotation whereby the closure cannot be opened from the exterior.

7. In a lock construction having a retractable latch bolt, a stationary housing adapted to be mounted in a transverse opening of a door, a pair of split tubular members one projecting to the interior and the other to the exterior of the door and having their inner, adjoining ends arranged within the housing in overlapping relation, a

knob mounted on the split outer projecting end of each member, a reinforcing inner sleeve conformably received and anchored against longitudinal movement within said members and having a longitudinal slot, said adjoining cnds being notched to provide arcuate camming projections, a push button associated with the knob on the inner member, a stem connected at one end to the button and its other end. slidably disposed in the inner sleeve, a locking lever slidably mounted in the inner sleeve and provided with projections extending into the slot of the inner sleeve and into the split of the outer member and longitudinally movable therein upon depressing the push button for locking engagement with a recess in the housing and thereby locking the outer member and its knob against rotation, means for retaining the push button and its stem depressed, and means actuated by the camming projection on the inner member upon turning of the inner knob and its tubular member for retracting the latch bolt with the outer member locked.

8. In a lock construction, a housing adapted to be mounted in a transverse opening of a door or other closure, a pair of aligned split tubular members having their inner, adjoining ends projecting into the housing, a knob mounted on the other split end of each member, a longitudinally slotted, reinforcing inner sleeve conformably received and retained against longitudinal movement in said members, said adjoining ends being notched to provide arcuate carnming projections, a push button at the inner knob, a stem connected at one end to the button and its other end slidable in the inner sleeve, a locking lever slidably mounted in the inner sleeve and having a part longitudinally movable in the slot of the inner sleeve upon depressing the push button for locking the outer mem-' her and its knob against rotation, means for retaining the push button and its stern depressed, means actuated by turning of the inner knob and its tubular member for retracting the latch bolt with the outer member locked,. and means for releasing said retaining means upon turning of the inner knob.

9. In a lock construction having a retractable latch bolt,'a stationary housing adapted to be mounted in a transverse opening of a door, a pair of split tubular members one projecting to the interior and the other to the exterior of the door and having their inner, adjoining ends arranged Within the housing in overlapping relation, a knob mounted on the split outer projecting end of each member, a reinforcing inner sleeve conformably received within and joining said members, saidends being notchedto provide arcuate camming projections, a push button associated with the knob on the inner member, a stem connected at one end to the button and its other end slidably disposed in the inner sleeve, a locking lever slidably mounted in the inner sleeve and longitudinally movable in said inner sleeve and in said split tubular member projecting to the exterior of the door upon depressing the push button for locking engagement with a recess in the housing and thereby locking the outer member and its knob against rotation, and a latching bar carried by the stem and adapted to project into an opening in the inner tubular member for retaining the push button and its stem depressed and the lever in locking position.

10. In a lock construction having a retractable latch bolt, a stationary housing adapted to be mounted in a transverse opening of a door, a pair of slotted tubular members one projecting to the interior and the other to the exterior of the door and having their inner, adjoining ends arranged within the housing in overlapping relation, a knob mounted on the outer projecting end of each member, a longitudinally slotted, reinforcing inner sleeve conformably received in and joining said members, said inner adjoining ends being notched to provide arcuate camming projections, a push button associated with the knob on the inner member, a stem connected at one end to the button and its other end slidably disposed in the inner sleeve, a locking lever slidably mounted in the inner sleeve and in said tubular member projecting to the exterior of the door, said locking lever being longitudinally movable in said inner sleeve and exterior tubular member and guided by their slots upon depressing the push button for locking engagement with a recess in the housing and thereby locking the outer member and its knob against rotation, a latching bar carried by the stem and adapted to project into an opening in the inner tubular member for retaining the push button and its stem depressed and the'lever in locking position, camming means on the end of the latching bar for disengaging this bar from its opening in the stem when the inner knob is rotated to retract the latch bolt, and a spring held under compression by the locked lever for disengaging this lever.

from its locking engagement with the housing.

11. In a lock construction of the type adapted for bathrooms, bedrooms and the like where privacy is desired, aligned inner and outer longitudinally slotted cam tubes with the adjacent inner'ends of these tubes notched to provide overlapping arcuate camming projections, a housing enclosing these camming projections with a cam tube projecting through and rotatable in each of the end walls of the housing, a longitudinally slotted inner tube received in the adjacent ends of the cam tubes for reinforcing the same, a knob attached to the outer ends of the cam tubes, a locking lever slidably mounted in the inner tube and in the outer cam tube and'guided by their slots, a push button on the inner knob connected to said lever and when depressed moving said lever into locking engagement with the housing whereby the outer cam tube and its knob are locked against rotation but the inner cam tube and its knob are free to rotate, a latch bolt adapted to be retracted by turning movement of the arcuate projection on either cam tube and a follower actuated by turning of the inner knob and its camtube? to rotate tis camming projections forretractingthelatch bolt. t I

. 12.-In a :lock construction of type adaptedbathrooms and the like where privacy is desired, longitudinally slotted cam tubes with the adjacent inner endsof these tubes notched to provide overlapping'arcuate camming projections, anhousing enclosing these camming: projections with a cam tube projecting through and ro-.

tatable in each of the end walls of the housing, a longi-- tudinally slotted inner carrier tube conformably received in the adjacent ends of the cam tubes, a knob attached to the outer'ends of the cam tubes, a locking lever slidably mounted in the inner tube and in the outer cam tube, and guided by their slots, a push button on, the inner.

knob connected to said lever and when depressed moving said lever into locking engagement with a slot in an end wall of the housing whereby the outer cam tube and its knob are locked against rotation but the inner cam tube and its knob are free to rotate, a latching bar for retaining the locking lever in locked position, a retractable latch bolt, means actuated by turning of the inner knob and its cam tube to rotate its camming projections for retracting the latch bolt, and means on said latching bar for releasing the locking lever upon turning of the inner cam tube and its knob.

13. In a lock construction having a retractable latch bolt, a stationary housing adapted to be mounted in a transverse opening of a door, a pair of split tubular members one projecting to the interior and the other to the exterior of the door and having their inner, adjoining ends arranged within the housing in overlapping relation, a knob mounted on the split outer projecting end of each member, a longitudinally slotted, reinforcing inner sleeve conformably received within said members and anchored against longitudinal movement therein, said adjoining ends being notched to provide arcuate camming projections, a push button associated with the knob on the inner member, a stem connected at one end to the button and its other end slidably disposed in the inner sleeve, a locking lever slidably mounted in the inner sleeve and longitudinally movable in its slot upon depressing the push button for locking engagement with a recess in the housing and thereby locking the outer member and its knob against rotation, and emergency release means carried by the member projecting to the exterior of the door for releasing the locking lever from locking engagement with the housing.

14. In a lock construction, a housing adapted to be mounted ina transverse opening of a door or other closure, a pair of aligned split tubular members having their inner, adjoining ends projecting into the housing, a knob mounted on the other end of each member, a longitudinally slotted, reinforcing inner sleeve conformably received and anchored in said members against longitudinal movement, said adjoining ends being notched to provide arcuate camming projections, a push button at the inner knob, a stem connected at one end to the button and its other end slidable in the inner sleeve, a locking lever slidably mounted in and having a part projecting into the slot of the inner sleeve and longitudinally movable in said inner sleeve and guided by its slot upon depressing the push button for locking the outer member and its knob against rotation, means for retaining the push button and its stem depressed, means actuated by the camming projection on the inner member upon turning of the inner knob and its tubular member for retracting 15. In a lock construction of the type adapted for bath 1 1 rooms, bedrooms and the like where privacy is desired, longitudinally slotted cam tubes with the adjacent inner ends of these tubes having camming surfaces, a stationary housing enclosing the camming surfaces with a cam tube projecting through and rotatable in each of the end walls of the housing, a longitudinally slotted inner carrier tube conformably received in the adjacent ends of the cam tubes, a knob attached to the outer ends of the cam tubes, a locking lever slidably mounted in the carrier tube and in the outer cam tube and guided by their slots, a push button on the inner knob connected to said lever and when depressed moving said lever into locking engage ment with a slot in an end wall of the housing whereby the outer cam tube and its knob are locked against rotation but the inner cam tube and its knob are free to rotate, a latching bar for retaining the locking lever in 12 locked position, a retractable latch bolt, means actuated by turning of the inner knob and its cam tube to rotate its carnming surfaces for retracting the latch bolt, means on said latching bar for releasing the locking lever upon turning of the inner cam tube and its knob, and means associated with the outer knob permitting emergency release of the locking lever and retraction of the latch bolt.

References Cited in the file of this patent UNITED STATES PATENTS 1,358,211 Huffman Nov. 9, 1920 1,880,675 Baume Oct. 4, 1932 1,918,719 Schlage July 18, 1933 2,304,612 Voight Dec. 8, 1942 

